Asymmetric Flange Design for Anti-Vibration Bracket Stress
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Solution Overview
Problem
Conventional anti-vibration devices experience significant stress concentration in the bracket when vibrations are input under specific conditions, particularly when the vibration input position does not coincide with the virtual line passing through the central axes of the metal fittings' through holes, leading to localized stress concentration.
Innovation Solution
The anti-vibration device incorporates a bracket made of synthetic resin with metal fittings that have a flange portion with a specific shape, where the first outermost peripheral edge is positioned closer to the vibration input and the second outermost peripheral edge is farther away, creating an elongated or elliptical outline shape to distribute stress effectively, and optionally includes additional flange portions on the opposite side, reducing stress concentration while minimizing the size of the flange portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flange portion has a conventional circular or non-circular shape, then the metal fitting can prevent relative rotation with the bracket, but large stress concentration occurs locally in the bracket when vibration is input at positions not on the virtual line
Solution Approach 1:
The flange portion is designed with an asymmetric shape where the first outermost peripheral edge extends farther from the central axis than the second outermost peripheral edge in the direction orthogonal to the virtual line. This asymmetric configuration creates a stress distribution pattern that suppresses stress concentration in the bracket when vibration is input at positions not on the virtual line, while maintaining the rotational prevention function through the non-circular outer peripheral shape
2Reliability
If the flange portion is made larger to distribute stress, then stress concentration is reduced, but the size of the metal fitting increases
Solution Approach 1:
The flange portion concentrates its stress-distributing geometry in specific local regions: the first outermost peripheral edge extends farther in the direction orthogonal to the virtual line to handle vibration loads from that direction, while the second outermost peripheral edge is positioned closer to minimize overall area. This localized geometric optimization achieves effective stress distribution without requiring a uniformly large flange portion
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses stress concentration in the bracket during vibrations, reducing the size of the flange portions and enhancing the distribution of stress, thereby improving the anti-vibration device's performance under specific conditions.
Implementation Method 1
a bracket (4) made of a synthetic resin and connected to the attachment member (2) via an elastic member (3)
Data Source
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AI summary
Provided is an anti-vibration device in which the stress concentration occurring in the bracket is suppressed when a vibration is input under specific conditions. The anti-vibration device (1) includes a bracket (4) made of a synthetic resin and cylindrical metal fittings for fastening (5) having a through hole (5h), where the bracket (4) and the metal fittings for fastening (5) are integrally formed. A vibration input position (P) is a position that does not coincide with a virtual line (L1) passing through central axes (O5) of the through holes (5h) of two metal fittings for fastening (5) in a planar view; the metal fitting for fastening (5) has a flange portion (51) on an edge side close to the vibration input position (P) in a direction along the central axis (O5); and the flange portion 51 has a first outermost peripheral edge (51a) and a second outermost peripheral edge (51b), where a length (L51a) to the first outermost peripheral edge (51a) is longer than a length (L51b) to the second outermost peripheral edge (51b) based on the center axis (O5) of the through hole (5h).